The FDA has issued a warning for the antibiotic drug Zithromax, commonly known as Z-pack or Zmax, due to the fact that the drug can cause disruption to the electrical activity of the heart. An investigation has been conducted since May 2012 to determine the side effects of Zithromax and therefore a warning was issued on Tuesday, March 12, 2013.
Zithromax is an antibacterial drug known as macrolides, which have been known to cause abnormal heart rhythm problems, which can lead to fatal heart conditions. In the research conducted by the New England Journal of Medicine, it was found that patients who took Zithromax were 2.5 times more likely to die due to heart related problems on a 5 day treatment plan when compared to patients using other antibiotics.
Patients with existing medical conditions were at higher risk of heart health issues as those without pre-existing medical conditions. Patients with low blood levels of potassium and/or magnesium, those with slower than normal heart rates and those taking certain drugs used to treat abnormal heart rhythms were at higher risk of complications when using Zithromax.
Pfizer, in 2011, made a profit of over $450 million in Zithromax sales. The drug is usually prescribed to patients suffering from urinary tract infections, tonsillitis and other bacterial infections. Patients should consult with their physicians before taking this drug and doctors should inform patients of the possible heart problem drug side effects of using this drug.